JP2005038630A - Vacuum interrupting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vacuum interrupting device composed by miniaturizing the entire device by connecting an interrupting part and an operation part. <P>SOLUTION: This vacuum interrupting device is characteristically equipped with: a movable shaft 27 comprising the interrupting part 21a formed of a vacuum valve 22 having a pair of contacts capable of contacting to and separating from each other, and the operation part 21b directly connected to the interrupting part 21a to be disposed on the extension of the contacting/separating direction of the vacuum valve 22 and set at the same potential as that thereof with one of the contacts of the vacuum valve 22 connected to the inside of the operation part 21b; an electromagnetic actuator connected to the movable shaft 27; and a control circuit for making and breaking the contacts of the vacuum valve 22 by the electromagnetic actuator. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vacuum interrupter used for overcurrent protection of a power system.
[0002]
[Prior art]
In a power system, when a short circuit accident or the like occurs, an overcurrent flows through the main circuit, and the device may be damaged by thermal energy due to the overcurrent at the point of the accident. For this reason, the circuit breaker which interrupts | blocks an overcurrent in a short time is installed in the electric power grid | system.
[0003]
Conventionally, in this type of circuit breaker, a vacuum circuit breaker using a vacuum valve having a pair of contacts that can be separated from each other in a rated voltage of 3.3 kV to 84 kV class as an arc extinguishing chamber is widely used (for example, Patent Document 1). reference.).
[0004]
As shown in FIG. 6, the vacuum shut-off device incorporating such a vacuum valve 1 is partitioned by a partition plate 2 into a shut-off portion 3a that serves as a charging portion on the back surface and an operation portion 3b that serves as a ground potential portion on the front surface. It has been. An insulating barrier 4 having a groove having a U-shaped cross section is vertically arranged in the blocking portion 3a, and the vacuum valve 1 is arranged along the groove portion in this groove portion. In this insulating barrier 4, a convex portion 4 a protruding from the U-shaped bottom is insulated and supported by the partition plate 2 and fixed.
[0005]
A fixed-side conductor 5 sandwiched between the flange 4b and the fixed energizing shaft 1a of the vacuum valve 1 is fastened and fixed to the upper flange 4b with bolts 6. An external movable energizing shaft 8 connected to the movable energizing shaft 7 of the vacuum valve 1 is movably penetrated through the lower flange 4c, and a movable side conductor 9 inserted through the external movable energizing shaft 8 is fixed. . The movable conductor 9 is interconnected with the electrode 11 by a flexible conductor 10 that can be expanded and contracted.
[0006]
On the other hand, the operation unit 3b of the vacuum interrupter includes a trip catch mechanism 12, a link link 14a connected to the trip pin 13 of the trip catch mechanism 12, a fan link 14b, a linear link 14c, and the like. 14 and a wipe spring 15 for applying a contact load to the contacts in the vacuum valve 1 are provided.
[0007]
The transmission of the operating force between the blocking portion 3a and the operating portion 3b is performed by the connecting bar 17 and the insulating operating rod 18 that rotate with the pin 16 as a fulcrum. An insulating operation rod 18 is connected to one end 17a of the connecting bar 17, and a wipe spring 15 is connected to the other end 17b. The insulating operation rod 18 also serves as an insulation between the charging portion and the ground potential portion as well as transmission of the operating force, and a plurality of pleats for ensuring a creepage distance are provided on the surface.
[0008]
In the operation of the vacuum shut-off device when the circuit is opened, when the pin 13 of the trip catch mechanism 12 rises upward and the curved link 14a rises upward in the drawing as shown by a dotted line, the connection bar 17 is connected via the links 14b and 14c. The other end 17b rises upward. As a result, one end 17a of the connecting bar 17 is lowered downward in the figure with the pin 16 as a fulcrum, the movable energizing shaft 7 connected to the insulating operation rod 18 is also lowered downward, and the pair of contacts in the vacuum valve 1 is connected. It is to be separated.
[0009]
In the closing operation, when the other end 17b of the connecting bar 17 is lowered downward in the figure by a closing spring (not shown), the one end 17a rises upward and the movable energizing shaft 7 connected to the insulating operation rod 18 is connected. Also, the pair of contacts in the vacuum valve 1 are brought into contact with each other.
[0010]
In a power system with such a vacuum circuit breaker installed, if a short-circuit accident occurs, a current transformer (not shown) detects an overcurrent in the system, and a circuit breaker signal is generated from the relay connected to this current transformer. It is done. This signal is input to the trip catch mechanism 12 to start the opening operation, and the overcurrent is interrupted between the contacts in the vacuum valve 1. When closing the circuit, a closing signal is issued from an external control panel, and the closing spring is operated to energize.
[0011]
[Patent Document 1]
JP 2000-78711 A (2nd page, FIG. 1)
[0012]
[Problems to be solved by the invention]
The conventional vacuum shut-off device has the following problems.
[0013]
For example, the vacuum circuit breaker is divided into a cut-off part 3a for the charging part and an operation part 3b for the ground potential part, so that they must be arranged on the back surface and the front surface to maintain an appropriate insulation distance. In addition, a structure for transmitting the operation force from the operation unit 3b to the blocking unit 3a has to be provided, and a link mechanism 14 including a large number of links, connection bars 17 and the like are necessary. Therefore, there has been a limit to miniaturization because of the insulation distance and the complicated structure of the operation mechanism.
[0014]
Also, in order to cut off the overcurrent, an auxiliary device such as a current transformer or a relay that detects the overcurrent of the power system is required, so these installation spaces are required, and they must be interconnected. The power system protection system was complicated.
[0015]
Furthermore, a power fuse may be used if it only cuts off the overcurrent. However, since this power fuse restores the power system after it is blown, it must be inspected and replaced. In addition, the circuit breaker for wiring can cut off the overcurrent. However, the restoration of the power system after the breakage has to manually close the contacts, requiring a lot of work. .
[0016]
Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a vacuum interrupting device that can be shut off using a simple shut-off means and can be easily restored by a control power source thereafter.
[0017]
[Means for Solving the Problems]
In order to achieve the above object, a vacuum interrupting device of the present invention includes a shut-off portion comprising a vacuum valve having a pair of contactable contacts, and an extension in the contact / separation direction of the vacuum valve directly connected to the shut-off portion. The operation unit is arranged on the line and has the same potential, and the operation unit includes a movable shaft in which one contact of the vacuum valve is coupled, an electromagnetic actuator coupled to the movable shaft, And a control circuit for opening and closing the contacts of the vacuum valve by an electromagnetic actuator.
[0018]
According to such a configuration, since the blocking portion and the operation portion are integrated and the movable shaft and the operation mechanism portion are charged portions having the same potential, it is not necessary to secure an insulation distance for separating and insulating them. .
[0019]
Further, since the overcurrent can be detected and cut off by a simple detection means, and the return of the electric power system after the cut-off can be operated by the operation mechanism of the operation unit, inspection and the like can be easily performed.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0021]
(First embodiment)
First, a vacuum interrupter according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view showing a configuration of a vacuum circuit breaker according to a first embodiment of the present invention, and FIG. 2 is a schematic diagram showing a current detection unit of the vacuum circuit breaker according to the first embodiment of the present invention. FIG. 3 is a circuit diagram showing a control circuit of the vacuum interrupter according to the first embodiment of the present invention. These drawings are a cross-sectional view and a circuit diagram for one phase of a three-phase circuit.
[0022]
As shown in FIG. 1, in the vacuum shut-off device of the present invention, a shut-off portion 21a on the upper side of the figure and a direct connection to the shut-off portion 21a, with a protruding portion 20a provided at a middle portion in the longitudinal direction of the cylindrical insulating tube 20 as a boundary. It is comprised by the operation part 21b of the lower illustration.
[0023]
A vacuum valve 22 having a pair of contactable and separable contacts is housed in the first insulating cylinder 20b in the blocking portion 21a. The vacuum valve 22 is fixed to a substantially central portion of one side surface of the L-shaped upper conductor 23 with a bolt 24, and this one side surface is a filling 25 embedded in the end surface of the first insulating cylinder 20 b. Are fixed with bolts 26. The other side surface of the upper conductor 23 is bent at a substantially right angle toward the outside of the insulating cylinder 20 to form one electric circuit.
[0024]
In the second insulating cylinder 20c connected to the first insulating cylinder 20b in the operation portion 21b, a spring portion 21b1 and an operation mechanism portion 21b2 connected to the blocking portion 21a are housed. Further, a current detector 21b3 for detecting the current of the main circuit is fixed to the side wall of the second insulating cylinder 20c.
[0025]
The movable shaft 27 of the vacuum valve 22 is moved to the spring portion 21b1 through the sliding contact 28 provided on the protruding portion 20a, and moves substantially in the center of the annular embedded conductor 29 molded integrally with the protruding portion 20a. It is freely inserted. Further, one end of a first stud 30 extending in the axial direction is clamped and fixed to the end of the movable shaft 27 with a disc-shaped wipe plate 31 interposed therebetween.
[0026]
In addition, an annular spring receiving plate 32 having an L-shaped cross section is disposed in the first stud 30 so that the L-shaped bottom surface faces the operation mechanism portion 21b2, and is inserted through the first stud 30 so as to be movable in the axial direction. ing. An annular wipe spring 33 is provided between the inner peripheral side of the spring receiving plate 32 and the wipe plate 31 so that a contact load is applied when the contacts in the vacuum valve 22 are in contact. An open spring 34 is provided between the outer peripheral side of the spring receiving plate 32 and the embedded conductor 29 to open the contacts in the vacuum valve 22 to the open position. A stopper plate 35 is fixed to the other end of the first stud 30 to prevent the spring receiving plate 32 from moving toward the operation mechanism 21b2.
[0027]
The operation mechanism portion 21 b 2 is provided with a second stud 36 connected to the other end of the first stud 30 so as to be movable through the yoke 37. A permanent magnet 38 is provided in the yoke 37 so as to be movably inserted into the second stud 36, and an armature 39 surrounds the second stud 36 at the end of the second stud 36. It is fixed at 40. Furthermore, a closed coil 41 and an open coil 42 are provided in the yoke 37 so as to surround the permanent magnet 38 and the armature 39.
[0028]
Here, the permanent magnet 38, the armature 39, the second stud 36, the closing coil 41, and the opening coil 42 incorporated in the yoke 37 constitute an electromagnetic actuator.
[0029]
The current detection unit 21b3 is provided with an L-shaped connection conductor 43 fixed to one side surface of the embedded conductor 29. The connection conductor 43 is molded integrally with the second insulating cylinder 20c along the inner surface of the second insulating cylinder 20c. An outer conductor 45 having one end fixed by a bolt 44 is connected to the inner surface of the connection conductor 43, and the other end is insulated through a current detector 46 fixed to the second insulating cylinder 20c. The tube 20 extends to the outside.
[0030]
The other end of the outer conductor 45 passes through one side surface of the L-shaped lower conductor 47, and the conductors 45, 47 are connected to each other by bolts 49, 50 through an L-shaped connection fitting 48. Further, the outer peripheral portion of one side surface of the lower conductor 47 is fixed to the filling 25 embedded in the end surface of the second insulating cylinder 20c with a bolt 26. Furthermore, the other side surface of the lower conductor 47 is bent at a substantially right angle toward the outer side of the insulating cylinder 20 to form the other electric circuit.
[0031]
In addition, the upper conductor 23 of one electric circuit and the lower conductor 47 of the other electric circuit are each fixed to a support insulator (not shown) and supported by insulation.
[0032]
Here, as shown in FIG. 2, the current detector 46 is composed of a first current detector (thermal deformation means) 46a and a second current detector (magnetic attraction means) 46b.
[0033]
In the first current detector 46 a, a bimetal 51 is disposed along the outer conductor 45, and one end is fixed with a bolt 52. At the other end, a protruding bar 53 is provided, and a first switch 54 accommodated in the current detector 46 is disposed opposite to the protruding bar 53. When a gradually increasing overcurrent flows through the outer conductor 45 of the main circuit conductor, the bimetal 51 is deformed as a dotted line due to heat generated by the internal resistance, and the protruding bar 53 contacts the contact of the first switch 54. It is supposed to be.
[0034]
The second current detector 46b is provided with a U-shaped first magnetic body 55 disposed so as to surround the outer conductor 45 with the U-shaped bottom surface portion fixed to the current detector 46 side. Yes. On the opened side of the first magnetic body 55, a second magnetic body 56 is provided via a gap g so as to cover the opened side.
[0035]
A trip bar 57 is fixed to the second magnetic body 56 so as to move freely through a hole 45 a provided in the outer conductor 45 and a hole 55 a provided in the center of the bottom surface of the first magnetic body 55. A guide plate 58 made of a non-magnetic material and extending to the second magnetic material 56 is fixed to both sides of the first magnetic material 55, so that the second magnetic material 56 and the trip bar 57 move linearly. It can be done. Between the second magnetic body 56 and the outer conductor 45, a spring 59 biased to spread the first magnetic body 55 and the second magnetic body 56 is provided. Further, a second switch 60 of the current detector 46 is disposed at the tip of the trip bar 57 so as to be opposed thereto.
[0036]
When a suddenly increasing overcurrent flows through the outer conductor 45 of the main circuit conductor, the first magnetic body 55 and the second magnetic body 56 form a closed magnetic flux circuit. Next, the second magnetic body 56 is attracted by the first magnetic body 55 and the tip of the trip bar 57 moves as indicated by the dotted line so that the tip of the trip bar 57 and the contact of the second switch 60 come into contact with each other. It has become.
[0037]
On the other hand, FIG. 3 shows a control circuit of the vacuum circuit breaker. The control circuit is divided into a high voltage side and a low voltage side by a first insulation transformer 61 and a second insulation transformer 62, respectively.
[0038]
On the high voltage side of the first isolation transformer 61, a diode 63 is connected in series in the forward direction, and a capacitor 64 is connected in parallel. An open circuit coil 42 is connected in series to the capacitor 64 via a first electromagnetic switch 65. A first switch 54 and a second switch 60 are connected in parallel to the first electromagnetic switch 65. Further, the closed coil 41 is connected to the capacitor 64 via a second electromagnetic switch 66 in parallel with the series circuit of the open coil 42. An AC power supply 67 is connected to the low voltage side.
[0039]
The exciting coil of the first electromagnetic switch 65 that operates with positive polarity is connected to the high-voltage side of the second insulating transformer 62 via a positive-direction diode 68. In addition, an exciting coil of a second electromagnetic switch 66 that operates with a negative polarity is connected via a negative-facing diode 69 in parallel with this circuit. Note that a manual switch 71 connected in series to a positive polarity power source 70 is connected to the low voltage side, and a manual switch 73 connected in series to a negative polarity power source 72 is connected in parallel to this circuit.
[0040]
Here, when an overcurrent that gradually rises due to overload flows in the power system, the overcurrent flows from the upper conductor 23 to the inside of the vacuum valve 22, the outer conductor 45, and the lower conductor 47. Thereby, each conductor 23, 45, 47 raises temperature by internal resistance. In the outer conductor 45, the bimetal 51 is deformed to operate by pressing the first switch 54, and the open coil 42 is excited by the current of the charged capacitor 64. This excitation is performed so that the armature 39 repels the permanent magnet 38.
[0041]
Accordingly, the armature 39 is separated from the permanent magnet 38, and the second stud 36 fixed to the armature 39 moves downward in the figure. Then, the first stud 30 and the movable shaft 27 connected to the second stud 36 are also moved downward in the figure by the spring force of the open spring 34, and the pair of contacts in the vacuum valve 22 are separated. Overcurrent can be cut off. Then, after the interruption, the open spring 34 is released and this state is maintained.
[0042]
In addition, when an overcurrent that rapidly rises in the power system flows, a large magnetic flux is generated in the outer conductor 45, and the second magnetic body 56 wins over the spring force of the spring 59 and is attracted to the first magnetic body 55 side. Thus, the trip bar 57 moves and presses the second switch 60 to operate. Along with this, the armature 39 repels the permanent magnet 38 in the same manner as described above, and the overcurrent can be interrupted.
[0043]
Further, when checking the power system, by turning on the manual switch 71, the contact of the first electromagnetic switch 65 is operated via the diode 68, and the open coil 42 is excited. Accordingly, the armature 39 repels the permanent magnet 38 in the same manner as described above, and the power supply system can be disconnected in the vacuum valve 22.
[0044]
When the circuit is closed, the manual switch 73 is turned on after the bimetal 51 is cooled and after the second magnetic body 56 is returned by the spring 59. As a result, the contact of the second electromagnetic switch 66 operates via the diode 69, and the closed coil 41 is excited by the current of the charged capacitor 64.
[0045]
This excitation is performed so that the armature 39 attracts the permanent magnet 38, so that the second stud 36 moves upward in the drawing. The movable shaft 27 connected to the second stud 36 also moves upward in the figure, and the pair of contacts in the vacuum valve 22 come into contact with each other. After the contact, a contact load is applied between the pair of contacts by the wipe spring 33, and the power system can be easily restored.
[0046]
According to the vacuum shut-off device of the first embodiment, since the shut-off part 21a and the operation part 21b have an integral structure, and the movable shaft 27 and the operation part 21b have the same potential, It is not necessary to secure an insulation distance for separating and insulating these components as in the apparatus.
[0047]
In addition, since overcurrent is detected by heat generated by the internal resistance of the external conductor 45 and magnetic flux of the external conductor 45, a conventional auxiliary device such as a current transformer or a relay is not required, thereby protecting the power system. The system can be simplified.
[0048]
Furthermore, since the pair of contacts in the vacuum valve 22 can be opened and closed by the electromagnetic actuator of the operation portion 21b, the power system can be easily inspected. In addition, the power system can be easily restored after the overcurrent is interrupted.
[0049]
(Second Embodiment)
Next, a vacuum interrupter according to a second embodiment of the present invention will be described with reference to FIG. FIG. 4 is a cross-sectional view of the main part showing the configuration of the vacuum interrupter according to the second embodiment of the present invention. The second embodiment is different from the first embodiment in that a predetermined gap is provided between the permanent magnet and the armature of the operation mechanism unit, and a wipe spring is not required. Note that the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
[0050]
In the present embodiment, a gap G of several mm is provided between the armature 39 fixed to the permanent magnet 38 and the second stud 36 in the operation mechanism portion 21b2. Further, only the open spring 34 is provided between the spring receiving plate 32 and the embedded conductor 29 in the spring portion 21b1.
[0051]
As a result, when the pair of contacts in the vacuum valve 22 are in contact with each other, the armature 39 is constantly attracted to the permanent magnet 38 by the gap G. A load is applied, and the wipe spring used in the first embodiment is not necessary.
[0052]
According to the vacuum shut-off device of the second embodiment, in addition to the effects of the first embodiment, the operation mechanism portion 21b can have a simple structure.
[0053]
(Third embodiment)
Next, a vacuum interrupter according to a third embodiment of the present invention will be described with reference to FIG. FIG. 5 is a cross-sectional view of the main part showing the configuration of the vacuum interrupter according to the third embodiment of the present invention. The third embodiment is different from the second embodiment in the configuration of the operation mechanism unit. Note that the same components as those in the second embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
[0054]
As shown in FIG. 5, the operation mechanism 21b2 connected to the blocking part 21a is accommodated in the second insulating cylinder 20c in the operation part 21b.
[0055]
One end of a third stud 80 extending in the axial direction of the movable shaft 27 of the vacuum valve 22 is fixed to the operation mechanism portion 21b2. At the other end, the third stud 80 penetrates the yoke 81 so as to be movable, and the armature 82 is fixed with a bolt 83. A permanent magnet 84 is provided in the yoke 81 so as to surround the third stud 80, and a closed coil 85 and an open coil 86 are provided so as to surround the armature 82.
[0056]
Here, the permanent magnet 84, the armature 82, the third stud 80, the closing coil 85, and the opening coil 86 incorporated in the yoke 81 constitute an electromagnetic actuator.
[0057]
Here, when the pair of contacts of the vacuum valve 22 is opened, the open coil 86 is excited by operating the first switch 54 or the second switch 60 and further the manual switch 71. This excitation is performed so that the armature 82 repels the permanent magnet 84. Along with this, the armature 82 moves downward in the figure, and the third stud 80 fixed to the armature 82 also moves downward in the figure. At the same time, the movable shaft 27 connected to the third stud 80 is also moved downward in the figure, and the pair of contacts in the vacuum valve 22 are opened. The open coil 86 is always excited and this state is maintained.
[0058]
In the case of closing, the closing coil 86 is excited by operating the manual switch 73. This excitation is performed so that the armature 82 is attracted to the permanent magnet 84, so that the third stud 80 moves upward in the drawing. Then, the movable shaft 27 connected to the third stud 80 also moves upward in the figure, and a pair of contacts in the vacuum valve 22 come into contact. Since the armature 82 and the permanent magnet 84 are always attracted while the pair of contacts are in contact, a contact load is applied between the contacts by this attracting force.
[0059]
According to the vacuum shut-off device of the third embodiment, in addition to the effects of the first embodiment, the spring portion of the operation portion 21b is unnecessary, so that a simple structure can be achieved.
[0060]
【The invention's effect】
As described above, according to the present invention, the operating portion is directly connected to the shut-off portion using the vacuum valve, and the movable shaft of the shut-off portion and the operating portion are at the same potential. It is no longer necessary to ensure, and the overcurrent is detected by simple detection means, so that the power system protection system can be simplified.
[0061]
Furthermore, according to the present invention, since the electromagnetic actuator can be used for the operation unit directly connected to the interruption unit and the interruption unit can be opened and closed, the inspection of the power system can be facilitated. In addition, the power system can be easily restored after the overcurrent is interrupted.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a configuration of a vacuum interrupter according to a first embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view showing a main part of a current detection unit of the vacuum interrupter according to the first embodiment of the present invention.
FIG. 3 is a circuit diagram showing a control circuit of the vacuum interrupter according to the first embodiment of the present invention.
FIG. 4 is a cross-sectional view of a main part showing a configuration of a vacuum interrupter according to a second embodiment of the present invention.
FIG. 5 is a cross-sectional view of a main part showing the configuration of a vacuum interrupter according to a third embodiment of the present invention.
FIG. 6 is a cross-sectional view showing a configuration of a conventional vacuum shut-off device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Vacuum valve 1a Fixed electricity supply shaft 2 Partition plate 3a Blocking part 3b Operation part 4 Insulation barrier 4a Convex part 4b Upper flange 4c Lower flange 5 Fixed side conductor 6 Bolt 7 Movable conduction axis 8 External movable conduction axis 9 Movable side conductor 10 Flexible Conductive conductor 11 Electrode 12 Trip catch mechanism 13 Trip pin 14 Link mechanism 14a Curved link 14b Fan-like link 14c Straight link 15 Wipe spring 16 Pin 17 Connecting bar 17a One end 17b The other end 18 Insulating operation rod 20 Insulating cylinder 20a Protruding portion 20b First 1 insulation cylinder 20c 2nd insulation cylinder 21a blocking part 21b operation part 21b1 spring part 21b2 operation mechanism part 21b3 current detection part 22 vacuum valve 23 upper conductor 24, 26, 40, 44, 49, 50, 52, 83 bolt 25 Filler 27 Movable shaft 28 Sliding contact 29 Embedded conductor 3 First stud 31 Wipe plate 32 Spring receiving plate 33 Wipe spring 34 Open spring 35 Stopper plate 36 Second stud 37, 81 Yoke 38, 84 Permanent magnet 39, 82 Armature 41, 85 Closed coil 42, 86 Open coil 43 Connecting conductor 45 External conductors 45a and 55a Hole 46 Current detector 46a First current detector (thermal deformation means)
46b Second current detector (magnetic attraction means)
47 Lower conductor 48 Connection fitting 51 Bimetal 53 Projection rod 54 First switch 55 First magnetic body 56 Second magnetic body 57 Trip bar 58 Guide plate 59 Spring 60 Second switch 61 First insulation transformer 62 First 2 Insulation transformers 63, 68, 69 Diode 64 Capacitor 65 First electromagnetic switch 66 Second electromagnetic switch 67 AC power supply 70 Positive power supply 71, 73 Manual switch 72 Negative power supply 80 Third stud

Claims (5)

A shut-off portion comprising a vacuum valve having a pair of contactable contacts;
It consists of an operating part that is directly connected to the blocking part and arranged on the extension line in the contact / separation direction of the vacuum valve, and at the same potential,
The operation unit has a movable shaft in which one contact of the vacuum valve is connected,
An electromagnetic actuator coupled to the movable shaft;
A vacuum circuit breaker comprising: a control circuit that opens and closes the contacts of the vacuum valve by the electromagnetic actuator. The electromagnetic actuator includes a stud connected to a movable shaft of the vacuum valve;
An armature fixed to the stud, and a permanent magnet disposed around the stud;
An open coil that excites the armature to repel the permanent magnet;
The vacuum circuit breaker according to claim 1, comprising a closed coil that excites the armature so as to attract the permanent magnet. The vacuum interrupter according to claim 1 or 2, wherein a gap is provided between the permanent magnet and the armature so that the closed coil is always excited so that the armature and the permanent magnet are attracted to each other. apparatus. The movable shaft connected to the vacuum valve is connected to a wipe spring that applies a contact load when the contacts are in contact, and an open spring that connects the contacts to a final open position is connected. The vacuum shut-off device according to claim 1 or 2, characterized in that. The vacuum circuit breaker according to any one of claims 1 to 3, wherein the open coil and the closed coil of the electromagnetic actuator are excited by a capacitor.

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